Uninterruptible power supply



FIG. 1 is a front view of an uninterruptible power supply in accordance with the present design;

FIG. 2 is a rear view of the uninterruptible power supply;

FIG. 3 is a top view of the uninterruptible power supply;

FIG. 4 is a bottom view of the uninterruptible power supply;

FIG. 5 is a left side view of the uninterruptible power supply;

FIG. 6 is a right side view of the uninterruptible power supply; and,

FIG. 7 is a perspective view of the uninterruptible power supply.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

The ornamental design for an uninterruptible power supply, substantially as shown and described. 